MOUNTING AND PREPARATION OP OBJECTS. 69 



hended, as they have been considerably hardened by 

 the alcohol), and transferred to a saucer containing 

 clove oil, in which they are left for two or three 

 hours, covered by a bell jar as before. 



The clove oil is removed from the section in the 

 same manner as the alcohol, and a drop or two of 

 damar placed upon it before its removal from the 

 spoon. When it becomes transparent, which gener- 

 ally takes place after the lapse of a few seconds, it is 

 floated on to the slide by the aid of a needle, and 

 finally mounted in the manner already described. 



The discovery of bacteria in diseased tissue, and 

 the probability that a special form accompanies each 

 disease, has excited considerable interest in the 

 labours of Elrich, Koch, and others, who have in- 

 vestigated the subject, and to whom we are indebted 

 for the methods of rendering the organisms visible. 



The following is a modification of the method 

 adopted for demonstrating the presence of the 

 tubercle bacillus in sputa or diseased tissue, and is 

 an abstract from a paper read in the pathological 

 section of the British Medical Association at Wor- 

 cester, in August, 1882, by Dr. Heneage G-ibbes. 

 The following stock solutions are prepared. 



I. Magenta Crystals, grammes 2. 

 Pure Aniline, C.C. 3. 



Alcohol sp. gr. -830, C.C. 20. 

 Distilled Water, C.C. 20. 



